FBI Deputy Director Andrew McCabe is said to be retiring this year. (Chip Somodevilla/Getty Images)

The current FBI boss reportedly threatened to resign amid mounting pressure from President Trump and Attorney General Jeff Sessions to fire his deputy director.

Sessions told the White House counsel that FBI Director Christopher Wray was upset about being pressured to get rid of Deputy Director Andrew McCabe, Axios reported Monday citing sources familiar with the situation.

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Don McGahn, the White House counsel, told Sessions it wasn't worth losing Wray over that issue, a source said.

"The President has enormous respect for the thousands of rank and file FBI agents who make up the world's most professional and talented law enforcement agency," White House spokesman Raj Shah told Axios.

President Trump sits with FBI Director Christopher Wray during the FBI National Academy graduation ceremony in December. (Evan Vucci/AP)

"He believes politically motivated senior leaders including former Director Comey and others he empowered have tainted the agency's reputation for unbiased pursuit of justice," Shah continued.

Wray's resignation would've created uproar since Trump fired then-FBI Director James Comey last May over his handling of the Hillary Clinton email investigation.

He took over the agency after the Senate confirmed him in August.

Attorney General Jeff Sessions during a news conference at the Department of Justice in Washington, D.C. in December. (Joshua Roberts/REUTERS)

Sessions began urging Wray to make a "fresh start" with his core team, including canning McCabe, since his confirmation, Axios reported Sunday.

Trump and GOP members had been slamming McCabe after reports said his wife accepted political denotations from a Clinton ally.

McCabe will reportedly resign this year after he becomes eligible for his pension.